Hi Tim! I'm a bit of a noob myself, but from what I understand, trees need lots of light. I would think hid lights would be your only option. Someone else here should be able to provide how much. Best of luck!

Thank you, D Z! I have looked at all types of lights, but I would like to get the most economical setup for exactly what I need. If I can accomplish growing Japanese Maples to a healthy height of 3 feet with 12 T5 HO bulbs over an area of 4 feet by 22", then I would probably jump on that. If I need more light, I am willing to explore that also.

I really thought that I would get a few more experienced opinions. I may post this, with an explanation, on another GardenForum site hoping to get more answers.

I really do appreciate you answering, my friend! Thank you very much!!

I grow a variety of herbs and other plants indoors under lights-specifically t12-without any growth issues. These are mostly plants that require full sun such as basil, rosemary and agave. That being said Japanese Maples do not require as much light as those full sun plants and in fact leaf scorch can occur if given too much light. I grow Japanese Maples in my garden and most are in mostly shade positions, so I would assume that the seedlings require the same growing conditions as their parents. So, I would not overthink the lighting if you want to grow them-I am sure they will be easier than you think.

Thanks for responding, way2may. I am also looking at a quantity of T8s instead of the T5s as a solution. And, I have an opportunity to pick up a 400w Floralux MH, used, on Craigslist for $75. I can get one new for less than $150, so I don't know whether to jump on it either. I am vacillating big time as I am new at this and don't want to spend money and then regret it.

I really do appreciate your kindness in responding, my friend. Thank you!